Gas Pipe Testing

Discussion in 'HVAC Heating & Cooling' started by FredC, Sep 14, 2007.

  1. FredC

    FredC New Member

    Feb 17, 2007
    For the Pro's on line
    I have recently installed about 115 feet of 1 1/4" black pipe with 3/4' stub outs to my furnaces, stove water heaters and other accessories in my home and need to understand proper testing before getting the propane tank. I built and attached a test rig with a shrader valve and a pressure gage on a tee in the trunk line at the point of entry into my house. I have applied 40 PSI to all lines and blown out any debris from the installation process.

    It is my undertsanding that you should put 15 to 20 PSI and hold for an hour. I put 20 psi on at 6:26 and just checked and am holding fine at 7:25. I will let it sit and check it in the morning, but am sure it will be fine. I had planned on getting into the attic to soap all the joints tomorrow, but am not sure how far to increase the pressure. I know propane and natural gas run between 1/2 PSI up to 14 inches water column.

    So my question is holding 20 PSI overnight good enough and what pressure should I use when I soap the joints in the morning. Thanks in advance

    Fred C
  2. got_nailed

    got_nailed DIY Senior Member

    Jan 11, 2006
    If you put it at 20 pounds and 12 hours latter it has slightly changed it could be off the air temp change.

    If it holds the presser then why are you soaping the joints? If it holds 20 pounds for an hour then you should pass you inspection but it dose not sound as your getting one.

    If you have an issue in the long run and you burn down your house then insurance will not do anything for you if it is not legal.
  3. Sponsor

    Sponsor Paid Advertisement

  4. CHH

    CHH New Member

    May 25, 2007
    Denver, CO
    Twenty psi overnight is beyond most code requirements. One jurisdiction required ten psi for ten minutes. My current jurisdiction requires twenty psi for twenty-four hours. Keep it at twenty to soap test the joints. Since you've already pressure tested there shouldn't be a problem.

    Don't forget to test again after appliance hook-up. As another poster mentioned, pull a permit and get it inspected. It might not be safer but it is one less loophole for the insurance folks.
  5. FredC

    FredC New Member

    Feb 17, 2007

    Got Nailed
    Thank you for your input, but did you mean I do not need to do any further testing, and please do not be so quick to assume I am trying to avoid an inspection. I am looking for advice before I call the propane company who will test my system to the regulations. The questions I asked were intended to assist me in performing tests that are "over and above" what the minimum requirements are. I live in the country and am only subject to inspection by the Railroad Coommission that regulates and oversees propane. Testing requirements are limited to 15 PSI for an hour. I am looking for the best test I can perform to satisfy myself, that goes beyond what the inspector wants and want to ensure that I not only meet, but exceed the state requirements. I understand that I have sized my gas pipe for about 550,000 BTU and want to ensure myself that everything is good. Thanks for your reply
  6. got_nailed

    got_nailed DIY Senior Member

    Jan 11, 2006
    I’m sorry; I read your post as you were doing this with out inspection. But if the psi only changes slightly in a 12 hours most of the time it will be because of temp change. There would be no need in soaping the joints unless there was a leak. If there is no leak then you will not see any bubbles with your soap water.

    I will say that one thing that dose get over looked is bonding the pipe to your electrical system with in 5 inches form coming into the house. With that much pipe it will fit under “likely to become energized†NEC.
  7. kd

    kd New Member

    Dec 11, 2006
    I think it is within 5 feet of gas pipe entry point.
  8. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    The electricians here bond it at the most convenient point, usually the gas line to the water heater.
Similar Threads: Pipe Testing
Forum Title Date
HVAC Heating & Cooling Round flex AC pipe Jun 10, 2017
HVAC Heating & Cooling Is the original pipe black pipe? Jan 6, 2016
HVAC Heating & Cooling hot water boiler with zero pressure air in pipes - how to purge/bleed air Dec 4, 2014
HVAC Heating & Cooling sealing of vent pipe at ceiling Dec 30, 2013
HVAC Heating & Cooling Help - what is this pipe coming through the foundation? Jun 15, 2013

Share This Page